Intergranular corrosion behavior of high nitrogen austenitic stainless steel

Hua-bing Li, Zhou-hua Jiang, Zu-rui Zhang, Yang Cao, Yan Yang

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    Hua-bing Li, Zhou-hua Jiang, Zu-rui Zhang, Yang Cao, and Yan Yang, Intergranular corrosion behavior of high nitrogen austenitic stainless steel, Int. J. Miner. Metall. Mater., 16(2009), No. 6, pp.654-660. https://dx.doi.org/10.1016/S1674-4799(10)60008-8
    Hua-bing Li, Zhou-hua Jiang, Zu-rui Zhang, Yang Cao, and Yan Yang, Intergranular corrosion behavior of high nitrogen austenitic stainless steel, Int. J. Miner. Metall. Mater., 16(2009), No. 6, pp.654-660. https://dx.doi.org/10.1016/S1674-4799(10)60008-8
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    Materials

    Intergranular corrosion behavior of high nitrogen austenitic stainless steel

    • School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China

    基金项目: 

    This work was financially supported by the National Natural Science Foundation of China (No.50534010) and Baosteel Group Corporation.

      通信作者:

      Zhou-hua Jiang E-mail: jiangzh@smm.neu.edu.cn

    中文摘要

    The intergranular corrosion (IGC) behavior of high nitrogen austenitic stainless steel (HNSS) sensitization treated at 650-950℃ was investigated by the double loop electrochemical potentiodynamic reactivation (DL-EPR) method. The effects of the electrolytes, scan rate, sensitizing temperature on the susceptibility to IGC of HNSS were examined. The results show that the addi-tion of NaCl is an effective way to improve the formation of the cracking of a passive film in chromium-depleted zones during the reactivation scan. Decreasing the scan rate exhibits an obvious effect on the breakdown of the passive film. A solution with 2 mol/L H2SO4+1 mol/L NaCl+0.01 mol/L KSCN is suitable to check the susceptibility to IGC of HNSS at a sensitizing temperature of 650-950℃ at a suitable scan rate of 1.667 mV/s. Chromium depletion of HNSS is attributed to the precipitation of Cr2N which results in the susceptibility to IGC. The synergistic effect of Mo and N is suggested to play an important role in stabilizing the passive film to prevent the attack of IGC.

     

    Materials

    Intergranular corrosion behavior of high nitrogen austenitic stainless steel

    Author Affilications

      • School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China

    • Funds: 

      This work was financially supported by the National Natural Science Foundation of China (No.50534010) and Baosteel Group Corporation.

    • Received: 14 December 2008;
    The intergranular corrosion (IGC) behavior of high nitrogen austenitic stainless steel (HNSS) sensitization treated at 650-950℃ was investigated by the double loop electrochemical potentiodynamic reactivation (DL-EPR) method. The effects of the electrolytes, scan rate, sensitizing temperature on the susceptibility to IGC of HNSS were examined. The results show that the addi-tion of NaCl is an effective way to improve the formation of the cracking of a passive film in chromium-depleted zones during the reactivation scan. Decreasing the scan rate exhibits an obvious effect on the breakdown of the passive film. A solution with 2 mol/L H2SO4+1 mol/L NaCl+0.01 mol/L KSCN is suitable to check the susceptibility to IGC of HNSS at a sensitizing temperature of 650-950℃ at a suitable scan rate of 1.667 mV/s. Chromium depletion of HNSS is attributed to the precipitation of Cr2N which results in the susceptibility to IGC. The synergistic effect of Mo and N is suggested to play an important role in stabilizing the passive film to prevent the attack of IGC.

     

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